DESC: Cleanroom-Grade Air Cleaner This critical environment air claeaner with certified HEPA performance removes 99.9% of all particles doen to 0.3 microns and 99.9% of all particle smaller that 0.3 microns. Pre-filter removes 65% of particulates at 0.3 microns (ASHRAE 90-95%, class F8), prolonging HEPA filter life span. Extra-large filters allow for long filter life and high air delivery (max. 320 cfm). Filtered air is evenly dispersed through a 320° vented diffuser positioned at the top of the unit. Modular design allows each air filter to be replaced individually. A filter life monitor notifies the user when filter replacement is needed.